From 5c1676dfe6d2f3c837a5e074117b45613fd29a72 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:30:19 +0200 Subject: Adding upstream version 2.10.34. Signed-off-by: Daniel Baumann --- app/display/gimpdisplayshell-rotate.c | 251 ++++++++++++++++++++++++++++++++++ 1 file changed, 251 insertions(+) create mode 100644 app/display/gimpdisplayshell-rotate.c (limited to 'app/display/gimpdisplayshell-rotate.c') diff --git a/app/display/gimpdisplayshell-rotate.c b/app/display/gimpdisplayshell-rotate.c new file mode 100644 index 0000000..d14f2a5 --- /dev/null +++ b/app/display/gimpdisplayshell-rotate.c @@ -0,0 +1,251 @@ +/* GIMP - The GNU Image Manipulation Program + * Copyright (C) 1995 Spencer Kimball and Peter Mattis + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#include "config.h" + +#include + +#include +#include + +#include "libgimpmath/gimpmath.h" + +#include "display-types.h" + +#include "gimpdisplay.h" +#include "gimpdisplayshell.h" +#include "gimpdisplayshell-expose.h" +#include "gimpdisplayshell-rotate.h" +#include "gimpdisplayshell-scale.h" +#include "gimpdisplayshell-scroll.h" +#include "gimpdisplayshell-transform.h" + + +#define ANGLE_EPSILON 1e-3 + + +/* local function prototypes */ + +static void gimp_display_shell_save_viewport_center (GimpDisplayShell *shell, + gdouble *x, + gdouble *y); +static void gimp_display_shell_restore_viewport_center (GimpDisplayShell *shell, + gdouble x, + gdouble y); + + +/* public functions */ + +void +gimp_display_shell_flip (GimpDisplayShell *shell, + gboolean flip_horizontally, + gboolean flip_vertically) +{ + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + + flip_horizontally = flip_horizontally ? TRUE : FALSE; + flip_vertically = flip_vertically ? TRUE : FALSE; + + if (flip_horizontally != shell->flip_horizontally || + flip_vertically != shell->flip_vertically) + { + gdouble cx, cy; + + /* Maintain the current center of the viewport. */ + gimp_display_shell_save_viewport_center (shell, &cx, &cy); + + /* freeze the active tool */ + gimp_display_shell_pause (shell); + + /* Adjust the rotation angle so that the image gets reflected across the + * horizontal, and/or vertical, axes in screen space, regardless of the + * current rotation. + */ + if (flip_horizontally == shell->flip_horizontally || + flip_vertically == shell->flip_vertically) + { + if (shell->rotate_angle != 0.0) + shell->rotate_angle = 360.0 - shell->rotate_angle; + } + + shell->flip_horizontally = flip_horizontally; + shell->flip_vertically = flip_vertically; + + gimp_display_shell_rotated (shell); + + gimp_display_shell_restore_viewport_center (shell, cx, cy); + + gimp_display_shell_expose_full (shell); + + /* re-enable the active tool */ + gimp_display_shell_resume (shell); + } +} + +void +gimp_display_shell_rotate (GimpDisplayShell *shell, + gdouble delta) +{ + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + + gimp_display_shell_rotate_to (shell, shell->rotate_angle + delta); +} + +void +gimp_display_shell_rotate_to (GimpDisplayShell *shell, + gdouble value) +{ + gdouble cx, cy; + + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + + /* Maintain the current center of the viewport. */ + gimp_display_shell_save_viewport_center (shell, &cx, &cy); + + /* Make sure the angle is within the range [0, 360). */ + value = fmod (value, 360.0); + if (value < 0.0) + value += 360.0; + + shell->rotate_angle = value; + + /* freeze the active tool */ + gimp_display_shell_pause (shell); + + gimp_display_shell_scroll_clamp_and_update (shell); + + gimp_display_shell_rotated (shell); + + gimp_display_shell_restore_viewport_center (shell, cx, cy); + + gimp_display_shell_expose_full (shell); + + /* re-enable the active tool */ + gimp_display_shell_resume (shell); +} + +void +gimp_display_shell_rotate_drag (GimpDisplayShell *shell, + gdouble last_x, + gdouble last_y, + gdouble cur_x, + gdouble cur_y, + gboolean constrain) +{ + gdouble pivot_x, pivot_y; + gdouble src_x, src_y, src_angle; + gdouble dest_x, dest_y, dest_angle; + gdouble delta_angle; + + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + + /* Rotate the image around the center of the viewport. */ + pivot_x = shell->disp_width / 2.0; + pivot_y = shell->disp_height / 2.0; + + src_x = last_x - pivot_x; + src_y = last_y - pivot_y; + src_angle = atan2 (src_y, src_x); + + dest_x = cur_x - pivot_x; + dest_y = cur_y - pivot_y; + dest_angle = atan2 (dest_y, dest_x); + + delta_angle = dest_angle - src_angle; + + shell->rotate_drag_angle += 180.0 * delta_angle / G_PI; + + gimp_display_shell_rotate_to (shell, + constrain ? + RINT (shell->rotate_drag_angle / 15.0) * 15.0 : + shell->rotate_drag_angle); +} + +void +gimp_display_shell_rotate_update_transform (GimpDisplayShell *shell) +{ + g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell)); + + g_clear_pointer (&shell->rotate_transform, g_free); + g_clear_pointer (&shell->rotate_untransform, g_free); + + if (fabs (shell->rotate_angle) < ANGLE_EPSILON || + fabs (360.0 - shell->rotate_angle) < ANGLE_EPSILON) + shell->rotate_angle = 0.0; + + if ((shell->rotate_angle != 0.0 || + shell->flip_horizontally || + shell->flip_vertically) && + gimp_display_get_image (shell->display)) + { + gint image_width, image_height; + gdouble cx, cy; + + shell->rotate_transform = g_new (cairo_matrix_t, 1); + shell->rotate_untransform = g_new (cairo_matrix_t, 1); + + gimp_display_shell_scale_get_image_size (shell, + &image_width, &image_height); + + cx = -shell->offset_x + image_width / 2; + cy = -shell->offset_y + image_height / 2; + + cairo_matrix_init_translate (shell->rotate_transform, cx, cy); + + if (shell->rotate_angle != 0.0) + cairo_matrix_rotate (shell->rotate_transform, + shell->rotate_angle / 180.0 * G_PI); + + if (shell->flip_horizontally) + cairo_matrix_scale (shell->rotate_transform, -1.0, 1.0); + + if (shell->flip_vertically) + cairo_matrix_scale (shell->rotate_transform, 1.0, -1.0); + + cairo_matrix_translate (shell->rotate_transform, -cx, -cy); + + *shell->rotate_untransform = *shell->rotate_transform; + cairo_matrix_invert (shell->rotate_untransform); + } +} + + +/* private functions */ + +static void +gimp_display_shell_save_viewport_center (GimpDisplayShell *shell, + gdouble *x, + gdouble *y) +{ + gimp_display_shell_unrotate_xy_f (shell, + shell->disp_width / 2, + shell->disp_height / 2, + x, y); +} + +static void +gimp_display_shell_restore_viewport_center (GimpDisplayShell *shell, + gdouble x, + gdouble y) +{ + gimp_display_shell_rotate_xy_f (shell, x, y, &x, &y); + + x += shell->offset_x - shell->disp_width / 2; + y += shell->offset_y - shell->disp_height / 2; + + gimp_display_shell_scroll_set_offset (shell, RINT (x), RINT (y)); +} -- cgit v1.2.3